Gamma-ray Burst 140320A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 20 Mar 14 02:13:10 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     416974369
GRB_RA:          281.650d {+18h 46m 36s} (J2000),
                 281.836d {+18h 47m 21s} (current),
                 280.996d {+18h 43m 59s} (1950)
GRB_DEC:          -2.700d {-02d 42' 00"} (J2000),
                  -2.684d {-02d 41' 01"} (current),
                  -2.755d {-02d 45' 16"} (1950)
GRB_ERROR:       13.65 [deg radius, statistical plus systematic]
GRB_INTEN:       158 [cnts/sec]
DATA_SIGNIF:     5.60 [sigma]
INTEG_TIME:      0.512 [sec]
GRB_DATE:        16736 TJD;    79 DOY;   14/03/20
GRB_TIME:        7966.11 SOD {02:12:46.11} UT
GRB_PHI:         285.00 [deg]
GRB_THETA:        20.00 [deg]
DATA_TIME_SCALE: 0.5120 [sec]
HARD_RATIO:      0.38
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      88%  GRB
2nd_MOST_LIKELY:   7%  Cyg X-1
DETECTORS:       0,0,0, 1,0,0, 1,0,0, 0,0,0, 0,0,
SUN_POSTN:       359.44d {+23h 57m 47s}   -0.24d {-00d 14' 26"}
SUN_DIST:         77.61 [deg]   Sun_angle= 5.2 [hr] (West of Sun)
MOON_POSTN:      217.11d {+14h 28m 25s}  -13.67d {-13d 39' 56"}
MOON_DIST:        64.82 [deg]
MOON_ILLUM:      88 [%]
GAL_COORDS:       29.98, -0.16 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      282.41, 20.24 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 67.42,16.55 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 20 Mar 14 02:13:24 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     416974369
GRB_RA:          284.550d {+18h 58m 12s} (J2000),
                 284.739d {+18h 58m 57s} (current),
                 283.886d {+18h 55m 33s} (1950)
GRB_DEC:          -5.040d {-05d 02' 23"} (J2000),
                  -5.020d {-05d 01' 11"} (current),
                  -5.108d {-05d 06' 29"} (1950)
GRB_ERROR:       6.19 [deg radius, statistical only]
DATA_SIGNIF:     5.70 [sigma]
DATA_INTERVAL:   0.512 [sec]
GRB_DATE:        16736 TJD;    79 DOY;   14/03/20
GRB_TIME:        7966.11 SOD {02:12:46.11} UT
GRB_PHI:         291.00 [deg]
GRB_THETA:        23.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       359.44d {+23h 57m 47s}   -0.24d {-00d 14' 26"}
SUN_DIST:         74.74 [deg]   Sun_angle= 5.0 [hr] (West of Sun)
MOON_POSTN:      217.11d {+14h 28m 26s}  -13.67d {-13d 39' 58"}
MOON_DIST:        67.10 [deg]
MOON_ILLUM:      88 [%]
GAL_COORDS:       29.21, -3.80 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      285.22, 17.63 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 20 Mar 14 02:14:12 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     592544,   Seg_Num: 0
POINT_RA:        281.853d {+18h 47m 25s} (J2000)
POINT_DEC:       -11.172d {-11d 10' 18"} (J2000)
IMG_START_DATE:  16736 TJD;    79 DOY;   14/03/20
IMG_START_TIME:  8046.14 SOD {02:14:06.14} UT,   7498.2 [sec] since BAT Trigger Time
COUNTS:          1    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        0    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 20 Mar 14 02:16:16 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     592544,   Seg_Num: 0
GRB_RA:          281.857d {+18h 47m 26s} (J2000),
                 282.054d {+18h 48m 13s} (current),
                 281.162d {+18h 44m 39s} (1950)
GRB_DEC:         -11.173d {-11d 10' 21"} (J2000),
                 -11.156d {-11d 09' 22"} (current),
                 -11.228d {-11d 13' 41"} (1950)
GRB_DATE:        16736 TJD;    79 DOY;   14/03/20
GRB_TIME:        7965.94 SOD {02:12:45.94} UT
TRIGGER_INDEX:   126
GRB_PHI:         -172.82 [deg]
GRB_THETA:        26.82 [deg]
DELTA_TIME:      -11.00 [sec]
TRIGGER_DUR:      [sec],  copy from BAT_POS unavailable
SOLN_STATUS:     0x0
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    0.00 [sigma]
LC_URL:          sw00592544000msb.lc
SUN_POSTN:       359.45d {+23h 57m 47s}   -0.24d {-00d 14' 23"}
SUN_DIST:         77.59 [deg]   Sun_angle= 5.2 [hr] (West of Sun)
MOON_POSTN:      217.13d {+14h 28m 32s}  -13.67d {-13d 40' 20"}
MOON_DIST:        63.27 [deg]
MOON_ILLUM:      88 [%]
GAL_COORDS:       22.52, -4.19 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      281.88, 11.78 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        WARNING: No BAT_Position TDRSS message was received for this trigger_number!  
COMMENTS:           
COMMENTS:        This does not match any source in the ground catalog.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 20 Mar 14 02:22:15 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     592544,   Seg_Num: 0
POINT_RA:        281.853d {+18h 47m 25s} (J2000)
POINT_DEC:       -11.173d {-11d 10' 21"} (J2000)
POINT_ROLL:      87.795d
IMG_START_DATE:  16736 TJD;    79 DOY;   14/03/20
IMG_START_TIME:  8053.42 SOD {02:14:13.42} UT,   7505.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.983
N_STARS:         190
X_OFFSET:        496 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1455 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      25
PHOTO_THRESH:    15
SL_URL:          sw00592544000msufc180305.fits
SUN_POSTN:       359.45d {+23h 57m 48s}   -0.24d {-00d 14' 17"}
SUN_DIST:         77.59 [deg]   Sun_angle= 5.2 [hr] (West of Sun)
MOON_POSTN:      217.19d {+14h 28m 45s}  -13.68d {-13d 41' 05"}
MOON_DIST:        63.21 [deg]
MOON_ILLUM:      88 [%]
GAL_COORDS:       22.52, -4.19 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      281.88, 11.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 20 Mar 14 02:22:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     592544,   Seg_Num: 0
POINT_RA:        281.853d {+18h 47m 25s} (J2000)
POINT_DEC:       -11.173d {-11d 10' 21"} (J2000)
POINT_ROLL:      87.795d
IMG_START_DATE:  16736 TJD;    79 DOY;   14/03/20
IMG_START_TIME:  8053.42 SOD {02:14:13.42} UT,   7505.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.983
N_STARS:         190
X_OFFSET:        496 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1455 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      25
PHOTO_THRESH:    15
SL_URL:          sw00592544000msufc180305.fits
SUN_POSTN:       359.45d {+23h 57m 48s}   -0.24d {-00d 14' 17"}
SUN_DIST:         77.59 [deg]   Sun_angle= 5.2 [hr] (West of Sun)
MOON_POSTN:      217.19d {+14h 28m 46s}  -13.69d {-13d 41' 08"}
MOON_DIST:        63.21 [deg]
MOON_ILLUM:      88 [%]
GAL_COORDS:       22.52, -4.19 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      281.88, 11.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 20 Mar 14 02:24:06 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     592544,   Seg_Num: 0
POINT_RA:        281.853d {+18h 47m 25s} (J2000)
POINT_DEC:       -11.173d {-11d 10' 21"} (J2000)
ROLL:            87.795d
IMG_START_DATE:  16736 TJD;    79 DOY;   14/03/20
IMG_START_TIME:  8053.42 SOD {02:14:13.42} UT,   7505.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     416974465
X_OFFSET:        815 [pixels]
Y_OFFSET:        850 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       975
Y_GRB_POS:       1010
BINNING_INDEX:   1
IM_URL:          sw00592544000msuni180317.fits
SUN_POSTN:       359.45d {+23h 57m 48s}   -0.24d {-00d 14' 16"}
SUN_DIST:         77.60 [deg]   Sun_angle= 5.2 [hr] (West of Sun)
MOON_POSTN:      217.21d {+14h 28m 49s}  -13.69d {-13d 41' 18"}
MOON_DIST:        63.19 [deg]
MOON_ILLUM:      88 [%]
GAL_COORDS:       22.52, -4.19 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      281.88, 11.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 20 Mar 14 02:24:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     592544,   Seg_Num: 0
POINT_RA:        281.853d {+18h 47m 25s} (J2000)
POINT_DEC:       -11.173d {-11d 10' 21"} (J2000)
ROLL:            87.795d
IMG_START_DATE:  16736 TJD;    79 DOY;   14/03/20
IMG_START_TIME:  8053.42 SOD {02:14:13.42} UT,   7505.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     416974465
X_OFFSET:        815 [pixels]
Y_OFFSET:        850 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       975
Y_GRB_POS:       1010
BINNING_INDEX:   1
IM_URL:          sw00592544000msuni180317.fits
SUN_POSTN:       359.45d {+23h 57m 48s}   -0.24d {-00d 14' 15"}
SUN_DIST:         77.60 [deg]   Sun_angle= 5.2 [hr] (West of Sun)
MOON_POSTN:      217.21d {+14h 28m 50s}  -13.69d {-13d 41' 21"}
MOON_DIST:        63.19 [deg]
MOON_ILLUM:      88 [%]
GAL_COORDS:       22.52, -4.19 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      281.88, 11.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #16000
J. K. Cannizzo (NASA/UMBC), J. A. Kennea (PSU), A. Y. Lien (NASA/GSFC/ORAU), C. J. Mountford (U Leicester), D. M. Palmer (LANL) and B. Sbarufatti (INAF-OAB/PSU) report on behalf of the Swift Team:
At 02:12:45 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140320A (trigger=592544). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 281.857, -11.173 which is
```
   RA(J2000) = 18h 47m 26s
   Dec(J2000) = -11d 10' 21"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with two peaks separated by ~140 sec and a total duration of about 150 sec. The peak count rate was ~3700 counts/sec (15-350 keV), at ~0 sec after the trigger.
No source was detected in 57 s of promptly downlinked data. We are waiting for the full dataset to detect and localise the XRT counterpart.
Due to partial real-time telemetry, no further information is available at this time. However the burst was also detected by the Fermi-GBM instrument, verifying its reality. More details will be available following the next ground pass telemetry dump.
Burst Advocate for this burst is J. K. Cannizzo (cannizzo AT milkyway.gsfc.nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #16001
G. Younes (USRA/MSFC) and V. Connaughton (UAH) report on behalf of the Fe= rmi GBM Team:
"At 02:12:46.11 UT on 19 March 2014, the Fermi Gamma-Ray Burst Monitor Triggered and located GRB 140320A (trigger 416974369/140320092), which was also detected by Swift (Cannizzo et al. 2014, GCN 16000).
The double peaked structure seen with BAT, with ~150 s separation, and reported by Cannizzo et al. is also visible with FERMI/GBM, however, a location analysis with GBM shows that the two peaks are unrelated. The first peak (trigger peak) is most likely due to a short/hard GRB located at RA~284.6 DEC~-5.0 deg, consistent with the BAT location. The second peak, 150 s after the trigger, is much softer and locates at RA~265.0 DEC~-28.0, the location of the bursting pulsar GRO J1744-28, which is currently active.
Hence, we encourage multi-wavelength follow-up observations of this candidate short/hard GRB.=94
GCN Circular #16010
K.L. Page, C. Pagani (U. Leicester) and J.K. Cannizzo (NASA/UMBC) report on behalf of the Swift-XRT team:
We have analysed 5 ks of XRT data for GRB 140320A (Cannizzo et al. GCN Circ. 16000), from 93 s to 11.8 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. We detect a faint, uncatalogued X-ray source with a mean count rate of (5.9 +/- 1.3) x 10^-3 count s^-1, at a position of RA, Dec = 281.85583, -11.19333, which is equivalent to
```
RA(J2000) =   18 47 25.4
Dec(J2000) = -11 11 36.9
```
with an uncertainty of 5.3 arcsec (radius, 90% confidence). This is 73 arcsec from the initial BAT position, within the BAT error circle. We cannot determine at this time whether the source is fading.
This circular is an official product of the Swift-XRT team.
GCN Circular #16011
K.L. Page, C. Pagani, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team:
Using 715 s of XRT Photon Counting mode data and 1 UVOT images, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 281.85530, -11.19412 which is equivalent to:
```
RA (J2000):  18 47 25.27
Dec (J2000): -11 11 38.8
```
with an uncertainty of 4.9 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular is an official product of the Swift-XRT team.
GCN Circular #16014
G. Younes (USRA/MSFC), V. Connaughton (UAH), C. Meegan (UAH), and A. von Kienlin (MPE) report on behalf of the Fermi GBM Team:
"At 02:12:46.11 UT on 20 March 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140320A (trigger 416974369/140320092), which was also detected by Swift (Cannizzo et al. 2014, GCN 16000). The GBM on-ground location, using the Fermi GBM trigger data, is consistent with the Swift/BAT location.
The angle to the Fermi LAT boresight is 24 deg. using the Swift location.
The GBM light curve consists of a single pulse with a duration (T90) of 1 s (50-300 keV). The time-averaged spectrum from T0-0.32 to T0+0.704 s is well fit by a simple power law function with index of -1.5 +/- 0.1.
The event fluence (10-1000 keV) in this time interval is (4.0 +/- 0.5) E-07 erg/cm^2. The 0.064-sec peak photon flux measured starting from T0-0.128 s in the 10-1000 keV band is 5.0 +/- 1.0 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #16016
K.L. Page, C. Pagani, P.A. Evans (U. Leicester) & J.K. Cannizzo (NASA/UMBC) report on behalf of the Swift-XRT team:
We have now analysed 9.8 ks of Swift-XRT data for GRB 140320A, between 93 s and 33.5 ks after the trigger. The X-ray source given by Page, Pagani & Cannizzo in GCN Circ. 16010 has now faded, with a 3-sigma upper limit on the count rate centred at 27 ks after the trigger of 1.2 x 10^-3 count s^-1. We therefore confirm this source as the X-ray afterglow of GRB 140320A.
This circular is an official product of the Swift-XRT team.
GCN Circular #16018
S. R. Oates (UCL-MSSL) and J. K. Cannizzo (NASA/UMBC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 140320A 3723 s after the BAT trigger (Cannizzo et al., GCN Circ. 16000). No optical afterglow consistent with the enhanced XRT position (Page et al., GCN Circ 16011) is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

v                 3723         5358          393         >19.2
b                 4543        10186         1149         >20.8
u                 4338         5973          393         >19.7
w1                4133         5768          393         >19.8
m2                3928         5563          393         >20.0
w2                3518         5153          393         >20.2
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.51 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #16020
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. K. Cannizzo (NASA/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 140320A (trigger #592544) (Cannizzo, et al., GCN Circ. 16000). The BAT ground-calculated position is RA, Dec = 281.843, -11.188 deg which is
```
   RA(J2000)  =  18h 47m 22.4s
   Dec(J2000) = -11d 11' 18.5"
```
with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 88%.
The mask-weighted light curve shows a double short-peaked structure starts at ~T-0.1 s. The second peak starts immediately at the end of the first peak at ~T+0.3 s, and ends at ~T+0.4 s. T90 (15-350 keV) is 0.45 +- 0.07 sec (estimated error including systematics).
The time-averaged spectrum from T-0.08 to T+0.44 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.24 +- 0.36. The fluence in the 15-150 keV band is 4.9 +- 1.0 x 10^-8 erg/cm2. The 1-sec peak photon flux measured from T-0.32 sec in the 15-150 keV band is 0.6 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
As noted in the Fermi/GBM circular (Younes et al.; GCN Circ. 16001), the pulse at ~T+140 s initially reported in Cannizzo, et al. (GCN Circ. 16000) is originated from a different source, the bursting pulsar GROJ1744-28. Therefore, GRB 140320A is a short burst.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/592544/BA/
GCN Circular #16026
Owen Littlejohns (ASU), Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), Eleonora Troja (GSFC), Enrico Ramirez-Ruiz (UCSC), Jos=E9 A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes=FAs Gonz=E1lez (UNAM), Carlos Rom=E1n-Z=FA=F1= iga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report:
We observed the field of GRB 140320A (Cannizzo, et al., GCN 16000) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=F3mico Nacional on Sierra San Pedro M=E1rtir from 2014/03 21.42 to 2014/03 21.51 UTC (31.77 to 33.94 hours after the BAT trigger), obtaining a total of 1.40 hours exposure in the r and i bands and 0.56 hours exposure in the Z, Y, J, and H bands.
For a source within the Swift-XRT error circle, in comparison with 2MASS, we obtain the following upper limits (3-sigma):
```
  r     > 22.70
  i     > 22.38
  Z     > 21.23
  Y     > 21.27
  J     > 20.82
  H     > 20.24
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.
GCN Report 462.1
GCN_Report 462.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_462_1.pdf by J.K. Cannizzo at NASA/UMBC titled: "Swift Observations of GRB 140320A"

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Jochen Greiner, last update: 26-Apr-2014 [Disclaimer]